Circuit and method for modifying a region of an encoded image

A video processing circuit, comprising:

• a display output;
• a processor operable to receive an encoded base image having first and second regions, an encoded overlay image, and an overlay signal, the processor being coupled to the display output;
• where the processor, responsive to the overlay signal, is operable to:
• decode the overlay image and the first region of the base image;
• combine the decoded overlay image with the decoded first region of the base image to form a modified first region of the base image;
• re-encode the modified first region of the base image;
• combine the encoded second region of the base image and the re-encoded modified first region of the base image to form an encoded modified base image;
• and
• provide the encoded modified base image on the display output;
• and
• provide the encoded base image on the display output in the absence of the overlay signal.

A video processing circuit, comprising a processor operable to:

• receive encoded images each having respective first and second regions, each of the first and second regions divided into respective image subregions;
• decode at least one of the image subregions in the first region of an image;
• modify the decoded image subregion;
• and
• re-encode the modified image subregion.

A video processing circuit, comprising:

• a display output;
• a processor coupled to the display output and operable to:
• receive a sequence of encoded images each having respective first and second regions, the sequence including intra-coded and non-intra-coded images;
• decode the first region of an intra-coded image;
• modify the decoded first region;
• re-encode the modified first region;
• combine the encoded second region of the intra-coded image and the reencoded modified first region of the intra-coded image to form an encoded modified intra-coded image;
• and
• provide the encoded modified intra-coded image on the display output.

A method, comprising:

• decoding an encoded overlay image and a first region of an encoded base image having the first region and a second region;
• combining the decoded overlay image with the decoded first region of the base image to form a blended first region of the base image;
• and
• re-encoding the blended first region of the base image.

A method, comprising:

• decoding at least one image subregion in a first region of an encoded image having the first region and a second region divided into respective image subregions;
• modifying the decoded image subregion;
• and
• re-encoding the modified image subregion.

A method. comprising:

• receiving an encoded image having first and second regions;
• decoding the first and second regions;
• changing the resolution of the first and second regions;
• modifying the first region after changing its resolution;
• and
• re-encoding the modified first region.

A method, comprising:

• receiving an encoded base image and an encoded overlay image;
• decoding the base image and the overlay image;
• and
• combining the decoded base image and the decoded overlay image in the transform domain to form a modified image.